Microwave measurement system for dispersive dielectric properties of densely packed pellets
Journal article, 2017

We present a microwave measurement system that is intended for the estimation of the dispersive dielectric properties for densely packed pellets. In particular, we estimate the Debye parameters for the effective permittivity of a mixture of air and densely packed moist microcrystalline cellulose pellets for the frequency band 2.7–5.1 GHz. The Debye parameters are estimated by means of minimizing the misfit between the measured scattering parameters and the corresponding computed response given a model of the measurement system. This minimization is performed by means of a nonlinear iterative optimization procedure, which is supported by continuum sensitivities, and the optimum is found in 10–60 iterations for the cases presented in this article. We find that increasing moisture content yields an increase in the static permittivity and a decrease in the relaxation time.

Permittivity

Sensitivities

Gradient-based optimization

Dispersive media

Finite element method

Microwave measurement

Microcrystalline cellulose

Author

Livia Cerullo

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

JOHAN WINGES

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Thomas Rylander

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Tomas McKelvey

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Lubomir Gradinarsky

AstraZeneca AB

Staffan Folestad

AstraZeneca AB

Mats Viberg

Chalmers, Signals and Systems, Signalbehandling och medicinsk teknik, Signal Processing

Measurement: Journal of the International Measurement Confederation

0263-2241 (ISSN)

Vol. 106 179-189

Subject Categories

Control Engineering

DOI

10.1016/j.measurement.2017.03.013

More information

Latest update

3/21/2018